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  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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• • A—HUMAN NECESSITIES
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
  • C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
  • C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
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  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
  • C07D413/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
  • C07D417/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings

Definitions

• This invention relates to 1-heteroaryl-pyrrolidine, -piperidine and -homopiperidine derivatives and to processes for the preparation of, intermediates used in the preparation of, compositions containing and the uses of, such derivatives.
• WO-A-96/40140, WO-A-96/40633 and WO-A-97/16190 disclose compounds that have neurotrophic activity but which lack inhibitory action at the protein phosphatase calcineurin and therefore which have no immunosuppressive activity.
• US-A-5,721,256 discloses sulphonamides
• WO-A-98/13343 and WO-A-98/13355 disclose heterocycles, that have neurotrophic activity but which do not exert any significant immunosuppressive activity
• WO-A-92/21313 discloses sulphonamides with immunosuppressive activity.
• EP0657451A2 discloses certain 2-(1-pyrrollidino)-benzoxazoles as leukotriene biosynthesis inhibitors. It is postulated that they may be effective in the treatment of disease such as asthma, rheumatoid arthritis, inflammatory bowel disease and psoriasis.
• the present compounds are neurotrophic agents which have an affinity for FKBP-type immunophilins.
• they are potent inhibitors of the enzyme activity and especially of the cis - trans prolyl isomerase (rotamase) activity of FKBP-type immunophilins, particularly the immunophilin FKBP-12.
• the present compounds do not significantly inhibit the protein phosphatase calcineurin and therefore lack any significant immunosuppressive activity.
• the present compounds therefore moderate neuronal degeneration and promote neuronal regeneration and outgrowth and can be used for treating neurological disorders arising from neurodegenerative diseases or other disorders involving nerve damage.
• the neurological disorders that may be treated include senile dementia (Alzheimer's disease) and other dementias, amyotrophic lateral sclerosis and other forms of motor neuron disease, Parkinson's disease, Huntington's disease, neurological deficits associated with stroke, all forms of degenerative disease affecting the central or peripheral nervous system (e.g. cerebellar-brainstem atrophies, syndromes of progressive ataxias), all forms of muscular dystrophy, progressive muscular atrophies, progressive bulbar muscular atrophy, physical or traumatic damage to the central or peripheral nervous system (e.g.
• peripheral neuropathy both diabetic and non-diabetic
• trigeminal neuralgia glossopharyngeal neuralgia
• Bell's Palsy all forms of auto-immune related disease resulting in damage of the central or peripheral nervous system (e.g. multiple sclerosis, myasthenia gravis, Guillain-Barré syndrome), AIDS related disorders of the nervous system, dapsone ticks, bulbar and retrobulbar affections of the optic nerve (e.g. retinopathies and retrobulbar neuritis), hearing disorders such as tinnitus, and prion diseases.
• the present compounds can be used for treating senile dementia (Alzheimer's disease) or another dementia, amyotrophic lateral sclerosis or another form of motor neuron disease, Parkinson's disease, Huntingdon's disease, a neurological deficit associated with stroke, physical or traumatic damage to the central or peripheral nervous system (e.g. spinal cord), a peripheral neuropathy (either diabetic or non-diabetic), multiple sclerosis or a hearing disorder such as tinnitus.
• senile dementia Alzheimer's disease
• another dementia amyotrophic lateral sclerosis or another form of motor neuron disease
• Parkinson's disease Huntingdon's disease
• a neurological deficit associated with stroke e.g. spinal cord
• peripheral neuropathy either diabetic or non-diabetic
• multiple sclerosis either diabetic or non-diabetic
• hearing disorder such as tinnitus.
• the present invention provides a compound of the formula: or a pharmaceutically acceptable salt thereof, wherein
• halo means fluoro, chloro, bromo or iodo and alkyl, alkoxy, alkenyl and alkylene groups containing the requisite number of carbon atoms, except where indicated, can be unbranched- or branched-chain.
• the pharmaceutically acceptable salts of the compounds of the formula (I) include the acid addition and the base salts thereof.
• Suitable acid addition salts are formed from acids which form non-toxic salts and examples are the hydrochloride, hydrobromide, hydroiodide, sulphate, bisulphate, nitrate, phosphate, hydrogen phosphate, acetate, maleate, fumarate, lactate, tartrate, citrate, gluconate, succinate, saccharate, benzoate, methanesulphonate, ethanesulphonate, benzenesulphonate, p -toluenesulphonate and pamoate salts.
• Suitable base salts are formed from bases which form non-toxic salts and examples are the sodium, potassium, aluminium, calcium, magnesium, zinc and diethanolamine salts.
• the pharmaceutically acceptable solvates of the compounds of the formula (I) include the hydrates thereof.
• a compound of the formula (I) contains one or more asymmetric carbon atoms and therefore exists in two or more stereoisomeric forms. Where a compound of the formula (I) contains an alkenyl or alkenylene group, cis (E) and trans (Z) isomerism may also occur.
• the present invention includes the individual stereoisomers of the compounds of the formula (I) and, where appropriate, the individual tautomeric forms thereof, together with mixtures thereof.
• Separation of diastereoisomers or cis and trans isomers may be achieved by conventional techniques, e.g. by fractional crystallisation, chromatography or H.P.L.C. of a stereoisomeric mixture of a compound of the formula (I) or a suitable salt or derivative thereof.
• An individual enantiomer of a compound of the formula (I) may also be prepared from a corresponding optically pure intermediate or by resolution, such as by H.P.L.C. of the corresponding racemate using a suitable chiral support or by fractional crystallisation of the diastereoisomeric salts formed by reaction of the corresponding racemate with a suitable optically active acid or base, as appropriate.
• A is 1,4-butylene.
• X is O, S or NH.
• X is O or NH.
• Y is O or NH.
• Y is NH
• R is azetidinyl, pyrrolidinyl or piperidinyl, each optionally substituted as previously defined for R for a compound of the formula (I).
• R is 3-azetidinyl, 3-pyrrolidinyl, 3-piperidinyl or 4-piperidinyl, each optionally substituted as previously defined for R for a compound of the formula (I).
• R is azetidinyl, pyrrolidinyl or piperidinyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from C 1 -C 6 alkyl, het, -CO 2 (C 1 -C 6 alkyl) and -CO(het), said alkyl being optionally substituted by 1 or 2 substituent(s) each independently selected from C 3 -C 7 cycloalkyl, aryl, het, -O(aryl), -O(C 1 -C 2 alkylene)aryl and -CONR 5 R 6 .
• R is 3-azetidinyl, 3-pyrrolidinyl, 3-piperidinyl or 4-piperidinyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from C 1 -C 6 alkyl, het, -CO 2 (C 1 -C 6 alkyl) and -CO(het), said alkyl being optionally substituted by 1 or 2 substituent(s) each independently selected from C 3 -C 7 cycloalkyl, aryl, het, -O(aryl), -O(C 1 -C 2 alkylene)aryl and -CONR 5 R 6 .
• R is azetidinyl, pyrrolidinyl or piperidinyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from ethyl, 2-pyridyl, tert-butoxycarbonyl, quinolin-2-ylcarbonyl, 2-phenylquinolin-4-ylcarbonyl, 4-methoxyquinolin-2-ylcarbonyl, 6-methoxy-2-phenylquinolin-4-ylcarbonyl, 2-piperidinoquinolin-4-ylcarbonyl, 2-chloroquinolin-4-ylcarbonyl, 1H-benzpyrazol-6-ylcarbonyl, cyclopropylmethyl, phenylmethyl, diphenylmethyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-(2-pyridyl)ethyl, 2-(2-methylimidazol-1-yl)ethyl, (1
• R is 3-azetidinyl, 3-pyrrolidinyl, 3-piperidinyl or 4-piperidinyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from ethyl, 2-pyridyl, tert-butoxycarbonyl, quinolin-2-ylcarbonyl, 2-phenylquinolin-4-ylcarbonyl, 4-methoxyquinolin-2-ylcarbonyl, 6-methoxy-2-phenylquinolin-4-ylcarbonyl, 2-piperidinoquinolin-4-ylcarbonyl, 2-chloroquinolin-4-ylcarbonyl, 1H-benzpyrazol-6-ylcarbonyl, cyclopropylmethyl, phenylmethyl, diphenylmethyl, 2-pyridylmethyl, 3-pyridylmethyl, 4-pyridylmethyl, 2-(2-pyridyl)ethyl, 2-(2-methylimidazol-1-yl
• R 1 , R 2 , R 3 and R 4 are each independently selected from H, halo(C 1 -C 6 )alkyl and halo.
• R 1 , R 2 , R 3 and R 4 are each independently selected from H, fluoro, chloro, bromo and trifluoromethyl.
• R 5 and R 6 are either each H or, when taken together, are 1,5-pentylene.
• aryl means a phenyl group, optionally substituted by CONR 5 R 6 , wherein R 5 and R 6 are preferably both H.
• hetero means pyridyl, imidazolyl, triazolyl, quinolinyl or benzpyrazolyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from C 1 -C 6 alkyl, C 1 -C 6 alkoxy, halo, phenyl and -NR 5 R 6 .
• hetero means pyridyl, imidazolyl, triazolyl, quinolinyl or benzpyrazolyl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from methyl, methoxy, fluoro, chloro, phenyl and piperidino.
• hetero means 2-pyridyl, 3-pyridyl, 4-pyridyl, imidazol-1-yl, 1H-1,2,4-triazol-3-yl, quinolin-2-yl, quinolin-3-yl, quinolin-4-yl or 1H-benzpyrazol-6-yl, each optionally substituted by 1, 2 or 3 substituent(s) each independently selected from C 1 -C 6 alkyl, C 1 -C 6 alkoxy, halo, phenyl and -NR 5 R 6 .
• hetero means 2-pyridyl, 3-pyridyl, 4-pyridyl, imidazol-1-yl, 1H-1,2,4-triazol-3-yl, quinolin-2-yl, quinolin-3-yl, quinolin-4-yl or 1H-benzpyrazol-6-yl, each optionally substituted by 1,2 or 3 substituent(s) each independently selected from methyl, methoxy, fluoro, chloro, phenyl and piperidino.
• “het” means 2-pyridyl, 3-pyridyl, 4-pyridyl, 1H-1,2,4-triazol-3-yl, quinolin-2-yl, quinolin-3-yl, quinolin-4-yl, 1H-benzpyrazol-6-yl, 2-methylimidazol-1-yl, 2-chloroquinolin-3-yl, 2-phenylquinolin-4-yl, 4-methoxyquinolin-2-yl, 6-methoxy-2-phenylquinolin-4-yl, 2-piperidinoquinolin-4-yl, 2-chloroquinolin-4-yl or 2-fluoropyridin-4-yl.
• the group of the formula: in a compound of the formula (I) is 1,3-benzoxazol-2-yl, 1,3-benzothiazol-2-yl, 1H-benzimidazol-2-yl, 6-bromo-1,3-benzoxazol-2-yl or 6-chloro-1,3-benzothiazol-2-yl.
• the compounds of the formula (I) can be prepared using conventional procedures such as by the following illustrative methods in which R, R 1 , R 2 , R 3 , R 4 , A, X and Y are as previously defined for a compound of the formula (I) unless otherwise stated.
• a pharmaceutically acceptable salt of a compound of the formula (I) may be readily prepared by mixing together solutions of a compound of the formula (I) and the desired acid or base, as appropriate.
• the salt may precipitate from solution and be collected by filtration or may be recovered by evaporation of the solvent.
• the affinity of the compounds of the formula (I) for FKBP-12 can be determined in vitro in a coupled colorimetric PPlase assay using similar procedures to published methods (e.g. see Kofron, J.L., et al ., Biochemistry, 1991, 30, 6127-6134, Zarnt, T., et al ., Biochem. J. 1995, 305, 159-164, Holt, D.A., et al., J. Am. Chem. Soc., 1993, 115, 9925-9938).
• the cis-trans isomerisation of a hydrophobic amino acid-proline bond in a tetrapeptide substrate e.g.
• the phenylalanine-proline bond in N-succinyl-ala-phe-pro-phe-p-nitroanilide can be determined by monitoring cleavage of pNA from the transPro-containing peptide by an excess of chymotrypsin.
• IC 50 the concentration of the compound of the formula (I) producing 50% inhibition
• Assay buffer 2.175ml
• 50mM 4-(2-hydroxyethyl)-1-piperazineethanesulphonic acid (HEPES) 100mM NaCl, 1mM dithiothreitol (DTT), pH 8.0
• HEPES 4-(2-hydroxyethyl)-1-piperazineethanesulphonic acid
• DTT dithiothreitol
• K i,app (the apparent inhibition constant) was determined for the present compounds using the assay procedure described below.
• Assay buffer (2.175ml) (50mM HEPES, 100mM NaCl, 1mM DTT, pH 8.0) is equilibrated to 10°C in a cuvette. 12.5 ⁇ l of a solution of the present compound in DMSO, 250 ⁇ l of a 60mg/ml solution of ⁇ -chymotrypsin in 1mM aqueous hydrochloric acid and then 50 ⁇ L of a solution of human recombinant FKBP-12 (1.5 ⁇ M) in assay buffer are added and mixed.
• the reaction is initiated by adding 12.5 ⁇ l of a solution of anhydrous succinyl-ALPF-pNA (100 ⁇ M final concentration) in a 400mM solution of LiCl in trifluoroethanol.
• the absorbance at 390nM is monitored for 3 minutes collecting data every 0.5 second.
• Data are fitted with a first order rate equation with offset and the initial velocity (v) is calculated from the concentration of cis ( re leu-pro bond)-succinyl-ALPF-pNA at t o and the first order rate constant at different inhibitor concentrations (I).
• [I] are fitted with an equation for reversible tight binding inhibition to generate values for K i,app (see Morrison, J.F., et al , Comments Mol. Cell Biophys., 1985, 2, 347-368).
• This analysis is used when the K i,app approaches the concentration of FKBP-12 in the assay (30nM).
• Dixon analysis (see Dixon, M., Biochem. J.,1953, 55, 170-171) is used for generating values of K i,app for less potent compounds.
• the same methodology is used to generate K i,app for FKBP52 with the following modifications: Forty microlitres human recombinant FKBP52 (5.2 ⁇ M) is substituted for FKBP12 and 2.185ml assay buffer are used in the assay.
• the compounds of the invention have inhibitory activity against the FKBP-12 enzyme. Early experimentation suggests that the compounds of the invention also have inhibitory activity against the FKPB-52 enzyme.
• the FKBP-52 enzyme can be expressed and characterised by the methodology described in Peattie, D.A., et al , Proc. Natl. Acad. Sci. USA 1992 Nov. 15; 89 (22):10974-8.
• the FKPB-52 enzyme is discussed in the following references: Miyata, Y., et al , Proc. Natl. Acad. Sci. USA 1997 Dec. 23; 94(26): 14500-5; Tai, P. K., et al , Biochemistry 1993 Aug. 31; 32(34): 8842-7; Bose, S. et al , Science, 274, 1715-5, 1996 and Czar, M. J., et al , Molecular Endocrinology 9, 1549-1560, 1995.
• the neurite outgrowth promoting activity of the compounds of the formula (I) can be determined in explant cultures of embryonic chick dorsal root ganglia.
• Dorsal root ganglia (DRG) are isolated aseptically according to the method of Bray (see “Culturing Nerve Cells", Ed. G.Banker and K. Goslin, MIT Press, Cambridge, MA, 1991, p.119).
• the individual ganglia were kept in Ca 2+ /Mg 2+ - free Tyrodes buffer on ice until a number of ganglia had been collected.
• Individual ganglia were then transferred into collagen-coated 24-well culture plates containing Neurobasal medium plus B27 supplements and incubated at 37°C in a 5% CO 2 atmosphere.
• the present compound was added after allowing 4 hours for the ganglia to attach.
• the explants were fixed and stained with Coomassie blue after 24 or 48 hours in culture.
• For each treatment 4 to 6 ganglia were analysed and scored by estimating the extent of neurite outgrowth relative to the diameter of the explant using image analysis.
• the present compounds were tested with and without 10ng/ml nerve growth factor (NGF) present and compared to outgrowth in the presence of 10ng/ml nerve growth factor alone.
• NGF nerve growth factor
• An alternative system for measuring neurite outgrowth promoting activity of FKBP-12 PPlase inhibitors is the SH-SY-5Y neuroblastoma model described by Gold, B.G., et al , in Exp. Neurol. ,1997, 147(2), 269-278.
• Cells are maintained in Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% Foetal calf serum (FCS), 50U/ml penicillin, 50 ⁇ g/ml streptomycin at 37°C in a 7% CO 2 atmosphere.
• DMEM Dulbecco's Modified Eagle's Medium
• FCS Foetal calf serum
• 50U/ml penicillin
• streptomycin 50 ⁇ g/ml streptomycin
• the neurotrophic activity of the present compounds can be evaluated in vivo using the sciatic nerve crush model in rat as a model for peripheral nerve regeneration (see Bridge, P.M., et al ., Experimental Neurology, 1994, 127, 284-290, Medinaceli, L., et al ., Expl. Neurology, 1982, 77, 634-643, Gold, B.G., et al ., Restorative Neurology and Neuroscience, 1994, 6, 287-296), the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and 6-hydroxydopamine models in various species as a model for regeneration in Parkinson's disease (see Mokry, J., Physiol.
• the compounds of the formula (I) can be administered alone but will generally be administered in admixture with a suitable pharmaceutical excipient, diluent or carrier selected with regard to the intended route of administration and standard pharmaceutical practice.
• the compounds of the formula (I) can be administered orally or sublingually in the form of tablets, capsules, ovules, elixirs, solutions or suspensions, which may contain flavouring or colouring agents, for immediate or controlled release applications.
• Such tablets may contain excipients such as microcrystalline cellulose, lactose, sodium citrate, calcium carbonate, dicalcium phosphate and glycine, disintegrants such as starch (preferably corn, potato or tapioca starch), alginic acid and certain complex silicates, and granulation binders such as polyvinylpyrrolidone, sucrose, gelatin and acacia. Additionally, lubricating agents such as magnesium stearate, sodium lauryl sulfate and talc may be included.
• excipients such as microcrystalline cellulose, lactose, sodium citrate, calcium carbonate, dicalcium phosphate and glycine
• disintegrants such as starch (preferably corn, potato or tapioca starch), alginic acid and certain complex silicates, and granulation binders such as polyvinylpyrrolidone, sucrose, gelatin and acacia.
• lubricating agents such as magnesium stearate, sodium lauryl
• Solid compositions of a similar type may also be employed as fillers in gelatin capsules.
• Preferred excipients in this regard include lactose or milk sugar as well as high molecular weight polyethylene glycols.
• the compounds of the formula (I) may be combined with various sweetening or flavouring agents, colouring matter or dyes, with emulsifying and/or suspending agents and with diluents such as water, ethanol, propylene glycol and glycerin, and combinations thereof.
• the compounds of the formula (I) can also be injected parenterally, for example, intravenously, intraperitoneally, intrathecally, intraventricularly, intrasternally, intracranially, intramuscularly or subcutaneously, or they may be administered by infusion techniques. They are best used in the form of a sterile aqueous solution which may contain other substances, for example, enough salts or glucose to make the solution isotonic with blood.
• aqueous solutions should be suitably buffered (preferably to a pH of from 3 to 9), if necessary.
• the preparation of suitable parenteral formulations under sterile conditions is readily accomplished by standard pharmaceutical techniques well-known to those skilled in the art.
• the daily dosage level of the compounds of the formula (I) will usually be from 1 microgram/kg to 25 mg/kg (in single or divided doses).
• tablets or capsules of the compound of the formula (I) may contain from 0.05 mg to 1.0 g of active compound for administration singly or two or more at a time, as appropriate.
• the physician in any event will determine the actual dosage which will be most suitable for any individual patient and it will vary with the age, weight and response of the particular patient.
• the above dosages are exemplary of the average case. There can, of course, be individual instances where higher or lower dosage ranges are merited and such are within the scope of this invention.
• the compounds of formula (I) can also be administered intranasally or by inhalation and are conveniently delivered in the form of a dry powder inhaler or an aerosol spray presentation from a pressurised container or a nebuliser with the use of a suitable propellant, e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, a hydrofluoroalkane such as 1,1,1,2-tetrafluoroethane (HFA 134A [trade mark] or 1,1,1,2,3,3,3-heptafluoropropane (HFA 227EA [trade mark]), carbon dioxide or other suitable gas.
• a suitable propellant e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, a hydrofluoroalkane such as 1,1,1,2-tetrafluoroethane (HFA 134
• the dosage unit may be determined by providing a valve to deliver a metered amount.
• the pressurised container or nebuliser may contain a solution or suspension of the active compound, e.g. using a mixture of ethanol and the propellant as the solvent, which may additionally contain a lubricant, e.g. sorbitan trioleate.
• a lubricant e.g. sorbitan trioleate.
• Capsules and cartridges (made, for example, from gelatin) for use in an inhaler or insufflator may be formulated to contain a powder mix of a compound of the formula (I) and a suitable powder base such as lactose or starch.
• Aerosol or dry powder formulations are preferably arranged so that each metered dose or "puff" contains from 20 ⁇ g to 20 mg of a compound of the formula (I) for delivery to the patient.
• the overall daily dose with an aerosol will be in the range of from 20 ⁇ g to 20 mg which may be administered in a single dose or, more usually, in divided doses throughout the day.
• the compounds of the formula (I) can be administered in the form of a suppository or pessary, or they may be applied topically in the form of a lotion, solution, cream, ointment or dusting powder.
• the compounds of the formula (I) may also be transdermally administered by the use of a skin patch. They may also be administered by the ocular route, particularly for treating neurological disorders of the eye.
• the compounds can be formulated as micronised suspensions in isotonic, pH adjusted, sterile saline, or, preferably, as solutions in isotonic, pH adjusted, sterile saline, optionally in combination with a preservative such as a benzylalkonium chloride.
• a preservative such as a benzylalkonium chloride.
• they may be formulated in an ointment such as petrolatum.
• the compounds of the formula (I) can be formulated as a suitable ointment containing the active compound suspended or dissolved in, for example, a mixture with one or more of the following: mineral oil, liquid petrolatum, white petrolatum, propylene glycol, polyoxyethylene polyoxypropylene compound, emulsifying wax and water.
• they can be formulated as a suitable lotion or cream, suspended or dissolved in, for example, a mixture of one or more of the following: mineral oil, sorbitan monostearate, a polyethylene glycol, liquid paraffin, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water.
• the compounds of the formula (I) can also be administered together with other neurotrophic agents such as neurotrophic growth factor (NGF), glial derived growth factor, brain derived growth factor, ciliary neurotrophic factor and/or neurotrophin-3.
• neurotrophic growth factor NGF
• glial derived growth factor glial derived growth factor
• brain derived growth factor glial derived growth factor
• ciliary neurotrophic factor ciliary neurotrophic factor and/or neurotrophin-3.
• the dosage level of the neurotrophic agent will depend upon the neurotrophic effectiveness of the combination and the route of administration used.
• Triethylamine (0.167ml) was added to a solution of (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylic acid (100mg) [see Preparation 3], 1-hydroxybenzotriazole hydrate (60.4mg), (3 R )-1-benzylpyrrolidin-3-ylamine (78.7mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (85.4mg) in dichloromethane (30ml).
• the title compound was prepared by a similar method to Example 1 from (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylic acid [see Preparation 3] and (3 S )-1-benzylpyrrolidin-3-ylamine.
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 50 : 50 : 1, changing to 20 : 80 : 1, by volume, hexane : ethyl acetate: 0.88 aqueous ammonia solution, in 10% increments.
• the title compound was prepared by a similar method to Example 3 from (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -[(3 S )benzylpyrrolidin-3-yl]-2-piperidinecarboxamide [see Example 2] and 20% palladium hydroxide on carbon to afford (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -[(3 S )-pyrrolidin-3-yl]-2-piperidinecarboxamide as a brown foam.
• the crude product was purified by column chromatography on silica gel eluting with a solvent system of 93 : 7 : 1, by volume, dichloromethane : methanol : 0.88 aqueous ammonia solution, and was then further purified by a second column eluting with 95 : 5, by volume, ethyl acetate : diethylamine to afford (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -[(3 S )-1-(2-pyridinyl)pyrrolidin-3-yl]-2-piperidinecarboxamide (11mg) as a brown oil.
• Potassium carbonate (0.052g) was added to a solution of (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -[(3 S )-pyrrolidin-3-yl]-2-piperidinecarboxamide (108.2mg) [see Example 4] and 2-(chloromethyl)pyridine in acetonitrile (6.8ml, 0.055M) at 0°C.
• 2-(Chloromethyl)pyridine was prepared from 2-(chloromethyl)pyridine hydrochloride by partitioning between diethyl ether and saturated aqueous sodium hydrogen carbonate solution. The separated organic phase was washed with brine, dried over magnesium sulphate and the solvent removed under reduced pressure.
• the residual free base was immediately dissolved in acetonitrile and used].
• the reaction mixture was stirred at room temperature for 18 hours, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water. The organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure.
• the title compound was prepared by a similar method to Example 5 from (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -[(3 S )-pyrrolidin-3-yl]-2-piperidinecarboxamide [see Example 4] and 1-(2-chloroethyl)-2-methyl-1 H -imidazole [see US Patent 3962274, CAN 85: 177416].
• the title compound was prepared by a similar method to Example 1 from (2 S )-1-(6-bromo-1,3-benzoxazol-2-yl)-2-piperidinecarboxylic [see Preparation 6] and (3 R )-1-benzylpyrrolidin-3-ylamine.
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 50 : 50 : 1 changing to 40 : 60 : 1, by volume, hexane : ethyl acetate : triethylamine.
• Trifluoroacetic acid (10ml) was added to a solution of tert -butyl 4-([(2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)piperidine-1-carboxylate (1.631g) [see Preparation 31] in dichloromethane (10ml) at 0°C.
• the reaction mixture was then warmed to room temperature and stirred for 2 hours, after which time the solvent was removed under reduced pressure and the residue was dissolved in water.
• Sodium hydrogen carbonate was added until the solution reached a pH of 8 and the product was then extracted with ethyl acetate.
• the title compound was prepared by a similar method to Example 6 from (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -(4-piperidinyl)-2-piperidinecarboxamide [see Example 31] and benzyl bromide.
• the crude product was purified by column chromatography on silica gel eluting with a solvent system of 93 : 7 : 1, by volume, dichloromethane : methanol : 0.88 aqueous ammonia solution to afford (2 S )-1-(1,3-benzoxazol-2-yl)- N 2 -(1-benzyl-4-piperidinyl)-2-piperidinecarboxamide as an oil.
• the hydrochloride salt was prepared by dissolving the title compound in ethyl acetate and bubbling hydrogen chloride gas through the solution, to afford the title compound as a white solid.
• the title compound was prepared by a similar method to Example 36 from (3 R ,5 S )-5-(phenoxymethyl)-1-(4-pyridinylmethyl)pyrrolidin-3-ol [see Preparation 38] and (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylic acid [see Preparation 3].
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 3 : 1 changing to 10 : 1, by volume, ethyl acetate : hexane to afford the title compound.
• the hydrochloride salt was prepared by addition of saturated hydrogen chloride gas in diethyl ether to a solution of product in ethyl acetate, and isolated as a white solid.
• the crude product was partly purified by column chromatography on silica gel eluting with a solvent gradient of 3 : changing to 1 : 1, by volume, ethyl acetate : hexane, the product was further purified by trituration with 95 : 5, by volume, hot hexane : ethyl acetate, followed by trituration with hot petroleum ether: diethyl ether, 95 : 5 to afford (3 S )-1-[(2-fluoro-4-pyridinyl)methyl]-3-piperidinyl (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylate.
• the title compound was prepared by a similar method to Example 1, excepting that a catalytic amount of 4-dimethylaminopyridine was also used, from (2 S )-1-(1,3-benzothiazol-2-yl)-2-piperidinecarboxylic acid [see Preparation 43] and (3 S )-1-(3-pyridinylmethyl)pyrrolidine-3-amine [see Preparation 41] to afford (2 S )-1-(1,3-benzothiazol-2-yl)- N -[(3 S )-1-(3-pyridinylmethyl)pyrrolidin-3-yl]-2-piperidinecarboxamide as a white solid.
• the title compound was prepared by a similar method to Example 1 from (2 S )-1-(6-chloro-1,3-benzothiazol-2-yl)-2-piperidinecarboxylic acid [see Preparation 45] and (3 S )-1-benzylpyrrolidin-3-ylamine [see J. Med. Chem. (1989), 31(8), 1586-1590] to afford (2 S )- N 2 -[(3S)-1-benzylpyrrolidin-3-yl]-1-(6-chloro-1,3-benzothiazol-2-yl)-2-piperidinecarboxamide as a solid.
• Ethyldiisopropylamine (6.52ml) was added to a solution of (2 S )-2-(methoxycarbonyl)piperidinium chloride (3.057g) [see Preparation 1] and 2-chlorobenzoxazole (2.13ml) in acetonitrile (50ml).
• the reaction mixture was stirred at room temperature for 18hours and then at 50°C for a further 2hours.
• the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water, the organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure.
• Aqueous lithium hydroxide (1N, 51ml) was added to a solution of methyl (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylate (8.987g) [see Preparation 2] in methanol (306ml) at 0°C.
• the reaction mixture was stirred at room temperature for 18hours, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water.
• 2,4,4,6-Tetrabromo-2,5-cyclohexadien-1-one (4.7g) was added to a solution of methyl (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylate (3.0g) [see Preparation 2] in dichloromethane (60ml) at -10°C over a period of 10 minutes. The reaction mixture was then warmed to room temperature and diluted with dichloromethane.
• the title compound was prepared by a similar method to Preparation 3 from methyl (2 S )-1-(6-bromo-1,3-benzoxazol-2-yl)-2-piperidinecarboxylate [see Preparation 5] and 1N aqueous lithium hydroxide solution, to afford (2 S )-1-(6-bromo-1,3-benzoxazol-2-yl)-2-piperidinecarboxylic acid as a pink foam.
• the title compound was prepared by a similar method to Example 1 from (2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinecarboxylic acid [see Preparation 3] and tert -butyl 4-amino-1(2H)-piperidinecarboxylate [see Takatani, Muneo et al , WO 9740051].
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 2 : 1 : 0 changing to 0 : 95 : 5, by volume, hexane : ethyl acetate : methanol to afford tert -butyl 4-([(2 S )-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)piperidinecarboxylate as a white foam.
• Methyl 4-methyl-1-benzenesulfonate (0.8g), triphenylphosphine (1.12g) and diethyl azodicarboxylate (0.68ml) were added sequentially to a solution of tert -butyl (2 S ,4 R )-2-[(benzyloxy)methyl]-4-hydroxy-1-pyrrolidine-1-carboxylate (1.1g) [see Takano, Seiichi, et al , J. Chem. Soc. Chem Commun. (1988), 23, 1527-1528] in dry tetrahydrofuran (10ml) at 10°C under a atmosphere of nitrogen.
• the reaction mixture was then stirred at room temperature for 48 hours, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water. The organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure.
• the crude product was purified by column chromatography on silica gel eluting with a solvent system of 85 : 15, by volume, hexane : ethyl acetate to afford the title compound as a colourless gum.
• Triphenylphosphine (421 mg) was added to a solution of tert -butyl (2 S ,4 R )-4-azido-2-[(benzyloxy)methyl]pyrrolidine-1-carboxylate (455mg) [see Preparation 33] in dry tetrahydrofuran (10ml). The reaction mixture was then stirred until the evolution of nitrogen gas had ceased, water (0.036ml) was added, the mixture was then stirred for a further 72 hours. The solvent was then removed under reduced pressure and the residue was dissolved in diethyl ether and hexane added until the mixture became cloudy. The supernatant liquid was separated and the solvent removed under reduced pressure.
• the title compound was prepared by a similar method to Preparation 35 from (3 R ,5 S )-5-(phenoxymethyl)pyrrolidine-3-ol [see Preparation 37] and 4-pyridinecarboxaldehyde.
• the crude product was purified by column chromatography on silica gel eluting with a solvent system of 95 : 5, by volume, chloroform : methanol to afford (3 R ,5 S )-5-(phenoxymethyl)-1-(4-pyridinylmethyl)pyrrolidine-3-ol as a white solid.
• the title compound was prepared by a similar method to Preparation 3 from ethyl (2 S )-1-(1,3-benzothiazol-2-yl)-2-piperidinecarboxylate [see Preparation 42] and 1N aqueous lithium hydroxide solution.
• the crude product was purified by column chromatography on silica gel eluting with a solvent system of 10 : 1, by volume, dichloromethane : methanol to afford (2 S )-1-(1,3-benzothiazol-2-yl)-2-piperidinecarboxylic acid as a solid.
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 90 : 10 changing to 80 : 20, by volume, hexane : ethyl acetate, in 5% increments to afford tert -butyl 2-[(2 S )-2-[(benzyloxy)carbonyl]-1-piperidinyl]-1 H -1,3-benzimidazole-1-carboxylate as an oil.
• the crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 70 : 30 changing to 50 : 50, by volume, hexane : ethyl acetate followed by 90 : 10 : 1, dichloromethane : methanol : 0.88 ammonia to afford 1,3,4,12a-tetrahydropyrido[1',2':3,4]imidazo[1,2- a ][1,3]benzimidazol-12(2 H )-one as a white solid.
• the compounds of the invention demonstrate inhibitory activity against the rotamase enzyme FKBP-12.
• some of the better compounds i.e. the compounds of examples 2, 6, 7, 8, 13a, 15, 16, 17,18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 30, 35 and 41 were found to have an IC 50 for inhibition of the FKBP-12 enzyme of below 1200nM.
• the compound of example 2 was found to have an IC 50 for inhibition of the FKBP-52 enzyme of 2790 nM.

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